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Diametral Pitches
Diametral pitches refer to the number of teeth per inch of the diameter of a gear, which determines the size of the teeth and the pitch of the gear.
Ratchet Wheel
A wheel or gear with teeth cut in a way that allows motion in one direction only, often used in mechanisms requiring incremental movement.
Pawl
A mechanical component that engages with another component to prevent motion in one direction, or to drive a mechanism intermittently.
Center
The point that is equally distant from all points on the circumference of a circle or the surface of a sphere; in geometry, it's the midpoint of any shape or object.
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